diff --git a/build/Aegisub/Aegisub.targets b/build/Aegisub/Aegisub.targets
index 16ddc987a..4614fe2ec 100644
--- a/build/Aegisub/Aegisub.targets
+++ b/build/Aegisub/Aegisub.targets
@@ -125,7 +125,6 @@
   <ItemDefinitionGroup>
     <ClCompile>
       <PreprocessorDefinitions>
-        __STDC_FORMAT_MACROS;
         NOMINMAX;
         %(PreprocessorDefinitions)
       </PreprocessorDefinitions>
diff --git a/src/Makefile b/src/Makefile
index 054af5f07..7914944c9 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -4,7 +4,7 @@ PROGRAM += $(d)src
 
 src_CPPFLAGS := -I$(d) -I.. -I$(d)include -I$(TOP)libaegisub/include -I$(TOP)build \
 	$(CFLAGS_PTHREAD) $(CFLAGS_FFTW3) $(CFLAGS_ICU)
-src_CXXFLAGS := -D__STDC_FORMAT_MACROS $(CXXFLAGS_WX)
+src_CXXFLAGS := $(CXXFLAGS_WX)
 src_LIBS := $(LIBS_GL) $(LIBS_PTHREAD) $(LIBS_WX) $(LIBS_FREETYPE) \
 	$(LIBS_LIBASS) $(LIBS_FONTCONFIG) $(LIBS_FFTW3)  $(LIBS_BOOST) $(LIBS_ICU)
 src_PCH := $(d)agi_pre.h